Failure investigation of main fitting subassembly of main landing gear of an aircraft

Madan, M and Sujata, M and Venkataswamy, MA and Bhaumik, SK (2008) Failure investigation of main fitting subassembly of main landing gear of an aircraft. Project Report. National Aerospace Laboratories, Bangalore, India.

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Abstract

The main fitting subassembly of main landing gear of an aircraft was sent to the laboratory for analyzing the mechanism and cause of failure. The subassembly was found broken at up-locking position. A part of the bearing was also found fractured and lost. Fractographic examination confirmed that the failure was by overload such as sudden impact. From gross fractographic features, it appears that in the sequence of failure, the plunger got fractured first resulting in fracturing of the bearing. Simultaneously, the hollow forged member made of Al-alloy got cracked along the forging-parting line with subsequent fracture. Analysis suggests that there could be oblique heavy landing of the aircraft which led to the sudden impact failure of the main fitting subassembly. There were no indications of progressive failure such as fatigue or stress corrosion cracking.

Item Type: Proj.Doc/Technical Report (Project Report)
Uncontrolled Keywords: Aircraft;Main landing gear;Impact failure
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division
Depositing User: Ms. Alphones Mary
Date Deposited: 25 Jul 2011 11:15
Last Modified: 25 Jul 2011 11:15
URI: http://nal-ir.nal.res.in/id/eprint/9520

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